In order to protect the copyright of the transmission and sharing of the geospatial information

this paper presents a robust watermarking algorithm for 2D vector graphics.In GIS system

vector graphics is a basic type of imformation and a large dataset of 2D vector graphics are often needed to perform watermark embedding for the security purpose.The processing method

Includes: Firstly

decompose the vector graphics into the polygons that layer has;Then analyze these polygons and embedded the watermark in the start and end points of the selected line.In the procedure of extracting watermark

the original graphics and the watermarked graphics were analyzed and extracted the sequence of the watermark information according to the position or the coordinate of the vector.The experimental results show that the method is rubust against the general operations of the spatial graphics such as transformation

translation

rotation

scaling

cropping and vertex insertion/removal etc.